I really enjoyed this trip to the world of San Francisco 2027. The science is understandable without being dumb downed and the mystery/suspense is revealed in onion-like layers. The characters are diverse group, and each serve a purpose within and to move along the story. My favorite character was Tansy, a Harley-Quinn type of bad ass who was so out there she was fun to read about. And Dr. Nathan Kim was dreamy without being "the perfect man."

I wasn't so into the format of the book; there are a lot of flashbacks (in the form of video recordings that were found), a lot of he said/she said via print media, in addition to the actual chapters. It made the book seem more like a novel based on a movie, so much so that I could picture certain actors playing characters (John Cho as Dr. Nathan Kim, Margo Robie as Tansy, George Clooney as Col Mitchell). I got used to the format pretty quickly, but there were times the extra stuff stopped the momentum of the present story. That is why I am giving the book 4 stars.

**This book was originally planned to be book one in a duology; however, someone somewhere along the publishing route decided to make this a trilogy. I won't be reading book two, as reviews are pretty consistent that it is nothing but filler and repetitive. I will look to read book three so I can see how the story ends.